Power supply unit



FIG. 1 is a top view of a first embodiment of a power supply unit according to my design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view of a second embodiment of the power supply unit showing my design;

FIG. 8 is a bottom view thereof;

FIG. 9 is a front view thereof; and,

FIG. 10 is a right side view thereof.

The back and left side views of the second embodiment are not shown as they are substantially mirror images of the front and right side views, respectively. 

The ornamental design for a power supply unit, as shown and described. 